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lib/fs: Fix single return points for get_cgroup2_* 

Functions get_cgroup2_id() and get_cgroup2_path() may call close() with
a negative argument.
Avoid that making the calls conditional on the file descriptors.

get_cgroup2_path() may also return NULL leaking a file descriptor.
Ensure this does not happen using a single return point.

Fixes: d5e6ee0dac ("ss: introduce cgroup2 cache and helper functions")
Fixes: 8f1cd119b3 ("lib: fix checking of returned file handle size for cgroup")
Signed-off-by: Andrea Claudi <aclaudi@redhat.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Andrea Claudi 2021-02-22 19:14:32 +01:00 committed by Stephen Hemminger
parent 1de363b180
commit b2d44b9a95
1 changed files with 9 additions and 6 deletions
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15
lib/fs.c
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@ -157,7 +157,8 @@ __u64 get_cgroup2_id(const char *path)
memcpy(cg_id.bytes, fhp->f_handle, sizeof(__u64));
out:
close(mnt_fd);
if (mnt_fd >= 0)
close(mnt_fd);
free(mnt);
return cg_id.id;
@ -179,16 +180,16 @@ char *get_cgroup2_path(__u64 id, bool full)
char *path = NULL;
char fd_path[64];
int link_len;
char *mnt;
char *mnt = NULL;
if (!id) {
fprintf(stderr, "Invalid cgroup2 ID\n");
return NULL;
goto out;
}
mnt = find_cgroup2_mount(false);
if (!mnt)
return NULL;
goto out;
mnt_fd = open(mnt, O_RDONLY);
if (mnt_fd < 0) {
@ -225,8 +226,10 @@ char *get_cgroup2_path(__u64 id, bool full)
"Failed to allocate memory for cgroup2 path\n");
out:
close(fd);
close(mnt_fd);
if (fd >= 0)
close(fd);
if (mnt_fd >= 0)
close(mnt_fd);
free(mnt);
return path;